Butler-LS » RHS

Racing Head Service™ - the legendary innovator of airflow technology – offers the ultimate in cylinder head, engine block and intake manifold performance. RHS® is proud to re-emerge as a member of the COMP Performance Group™ with the industry’s largest and most advanced airflow technology team. By combining knowledge with valve train experts at COMP Cams® for more comprehensive R&D efforts, our engineers have been able to develop some of the highest flowing, best performing cylinder heads and intake manifolds in the performance aftermarket. Butler LS and RHS, when lack of performance is not an option.